BACKGROUND The foraging choices of honey bees are influenced by many factors, such as floral aroma. The composition of volatile compounds influences the bioactivity of the aromatic plants and honey produced from them. In this study, Agastache rugosa was evaluated as part of a project to select the most promising medicinal plant species for production of bioactive honey. METHODS Headspace soli...

Headspace solid-phase microextraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS) have traditionally been used, in combination with other analyses, for the chemical characterization of organic residues recovered from archaeological specimens. Recently in many life science fields, comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry (GCˆGC-TOFMS) has p...

The unique flavor of the proso millet (Panicum miliaceum L.) is one key reasons why consumers prefer it. Fatty acids and amino have an important influence on nutrition millet. In this study, we identified fatty acids, volatile compositions in waxy non-waxy porridge by a headspace solid phase microextraction (HS-SPME) method conjunction with gas chromatography-mass spectrometry (GC-MS). We 8 7 e...

Abstract The present work is part of a comprehensive study aiming to identify and quantify an array harmful contaminants at very low concentrations in recycled paperboard materials intended for food contact applications. In this initial study, three commonly used extraction techniques were optimized tested their efficacy accuracy isolating 13 polycyclic aromatic hydrocarbons (PAHs) from commerc...

Livestock is an important source of volatile organic compounds (VOCs) that can cause odor nuisance and pollution. The main sources these VOCs in livestock are effluents their management system. In this study, the applicability headspace-solid phase microextraction coupled with gas chromatography-mass spectrometry (HS-SPME-GC-MS) for VOC characterization effluent samples both laboratory field te...

This work presents a comparative study of the analytical characteristics of two methods for the analysis of carbonyl compounds in wine, both based on the derivatization with O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride (PFBHA). In the first method derivatives are formed in the solid phase extraction (SPE) cartridge in which the analytes have been previously isolated, while in the ...

AIMS A novel method has been developed that allows successful differentiation between Clostridium difficile culture-positive and culture-negative stool samples based on volatile organic compound (VOC) evolution and detection by headspace solid-phase microextraction coupled with gas chromatography mass spectrometry (HS-SPME-GC-MS). METHODS AND RESULTS The method is based on the activation of p...

Thermophilic bacteria play an important role in aroma formation during pile-fermentation process of dark tea. With the aim to reveal impact thermophilic on volatile compounds tea, Bacillus licheniformis (thermophilic bacteria) were inoculated into sun-dried green tea for spontaneous fermentation. In this study, headspace solid phase microextraction combined gas chromatography mass spectrometry ...

The preparation and applicability of solid phase microextraction (SPME) fibers coated with a sol-gel organically modified silica based on 3-aminopropyltrimethoxysilane and polydimethylsiloxane (APTMS/PDMS) are described here. Micrographs of the coated fibers revealed a rugous surface; the thickness of the coating was estimated to be less than 30 microm. The APTMS/PDMS fibers were tested with sy...

Solid-phase microextraction (SPME) is a versatile new technique for collecting headspace volatiles prior to GC analysis. The commercial availability of uniform SPME fibers makes routine, practical quantitation of headspace concentrations possible, but straightforward information for relating GC peak areas from SPME analyses to headspace concentrations has not been available. The calibration fac...